ST’s integrated tunable capacitors offer excellent RF performance, low power consumption and high linearity required in adaptive RF tuning applications. The fundamental building block of a passive tunable integrated circuit (PTIC) is a tunable material called Parascan™, which is a version of barium strontium titanate (BST) developed by Paratek microwave.
ST’s Parascan™ tunable integrated capacitors (STPTIC) are available with a typical capacitance from 1.5 to 8.2 pF and offer excellent RF performance, low power consumption and high linearity required in adaptive RF tuning applications. The STPTIC G series is optimized for impedance matching (standard linearity) while the STPTIC L series is optimized for frequency tuning (high linearity).
These tunable capacitors are controlled through an extended bias voltage ranging from 1 to 24 V. Over the bias range, the capacitance tuning ratio is 5 to 1.
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ST’s new range of BST (barium strontium titanate) tunable capacitors in a WLCSP package uses solder bars instead of bumps. In addition to increasing the chip’s mechanical strength when soldered on thin printed circuit boards, the 3-solder bar package is smaller than a 4-bump device, making this new C4 series of Parascan™ tunable integrated capacitors (STPTIC) even more suited for high-volume manufacturing.
There are currently three RF tunable capacitors with solder bars: STPTIC-15C4 and STPTIC-27C4 are high-linearity devices used in frequency-tuning applications and the STPTIC-82C4 with standard linearity is best suited for impedance matching. A common land pattern can be used in order to support passive tunable integrated circuit (PTIC) values ranging from 1.5 to 8.2 pF.